Problem whith "Document Library" block

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I installed Document library 2.0.3 on my Concrete5 web site (version 8.5.1).
I insert a block of document library in a new page with a folder "test" and all is ok
I see the list of subfolders and files but when i click on a subfolder the new page is white. I think there is something wrong in the url ".../ccm/system/block/action/edit/298/Main/3262/navigate/157"
Can you help me?
Thank you